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tkrzw_dbm_tree.cc
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tkrzw_dbm_tree.cc
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/*************************************************************************************************
* File database manager implementation based on B+ tree
*
* Copyright 2020 Google LLC
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
* https://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
*************************************************************************************************/
#include "tkrzw_sys_config.h"
#include "tkrzw_containers.h"
#include "tkrzw_dbm.h"
#include "tkrzw_dbm_common_impl.h"
#include "tkrzw_dbm_hash.h"
#include "tkrzw_dbm_tree.h"
#include "tkrzw_dbm_tree_impl.h"
#include "tkrzw_file.h"
#include "tkrzw_file_mmap.h"
#include "tkrzw_file_pos.h"
#include "tkrzw_file_std.h"
#include "tkrzw_file_util.h"
#include "tkrzw_lib_common.h"
#include "tkrzw_str_util.h"
#include "tkrzw_thread_util.h"
namespace tkrzw {
constexpr char META_MAGIC_DATA[] = "TDB";
constexpr int32_t META_OFFSET_NUM_RECORDS = 4;
constexpr int32_t META_OFFSET_EFF_DATA_SIZE = 10;
constexpr int32_t META_OFFSET_ROOT_ID = 16;
constexpr int32_t META_OFFSET_FIRST_ID = 22;
constexpr int32_t META_OFFSET_LAST_ID = 28;
constexpr int32_t META_OFFSET_NUM_LEAF_NODES = 34;
constexpr int32_t META_OFFSET_NUM_INNER_NODES = 40;
constexpr int32_t META_OFFSET_MAX_PAGE_SIZE = 46;
constexpr int32_t META_OFFSET_MAX_BRANCHES = 49;
constexpr int32_t META_OFFSET_TREE_LEVEL = 52;
constexpr int32_t META_OFFSET_KEY_COMPARATOR = 53;
constexpr int32_t META_OFFSET_OPAQUE = 54;
constexpr int32_t NUM_PAGE_SLOTS = 64;
constexpr double INNER_PAGE_CACHE_RATIO = 0.25;
constexpr double HOT_CACHE_RATIO = 0.35;
constexpr int32_t PAGE_ID_WIDTH = 6;
constexpr int32_t ADJUST_CACHES_INV_FREQ = 4;
constexpr int64_t LEAF_NODE_ID_BASE = 1LL;
constexpr int64_t INNER_NODE_ID_BASE = (1LL << (8 * PAGE_ID_WIDTH - 2)) * 3;
constexpr int32_t WRITE_BUFFER_SIZE = 16384;
constexpr int32_t TREE_LEVEL_MAX = 32;
constexpr int32_t ITER_BUFFER_SIZE = 128;
class TreeDBMImpl;
struct TreeLeafNode final {
TreeDBMImpl* impl;
int64_t id;
int64_t prev_id;
int64_t next_id;
std::vector<TreeRecord*> records;
int32_t page_size;
bool dirty;
bool on_disk;
SpinSharedMutex mutex;
TreeLeafNode(TreeDBMImpl* impl, int64_t prev_id, int64_t next_id);
TreeLeafNode(TreeDBMImpl* impl, int64_t id, int64_t prev_id, int64_t next_id,
std::vector<TreeRecord*>&& records, int32_t page_size);
~TreeLeafNode();
std::shared_ptr<TreeLeafNode> AddToCache();
};
struct TreeInnerNode final {
TreeDBMImpl* impl;
int64_t id;
int64_t heir_id;
std::vector<TreeLink*> links;
bool dirty;
bool on_disk;
TreeInnerNode(TreeDBMImpl* impl, int64_t heir_id);
TreeInnerNode(TreeDBMImpl* impl, int64_t id, int64_t heir_id, std::vector<TreeLink*>&& links);
~TreeInnerNode();
std::shared_ptr<TreeInnerNode> AddToCache();
};
typedef DoubleLRUCache<TreeLeafNode> LeafCache;
typedef LRUCache<TreeInnerNode> InnerCache;
struct LeafSlot final {
std::unique_ptr<LeafCache> cache;
SpinMutex mutex;
};
struct InnerSlot final {
std::unique_ptr<InnerCache> cache;
SpinMutex mutex;
};
class TreeDBMImpl final {
friend struct TreeLeafNode;
friend struct TreeInnerNode;
friend class TreeDBMIteratorImpl;
typedef std::list<TreeDBMIteratorImpl*> IteratorList;
public:
TreeDBMImpl(std::unique_ptr<File> file);
~TreeDBMImpl();
Status Open(const std::string& path, bool writable,
int32_t options, const TreeDBM::TuningParameters& tuning_params);
Status Close();
Status Process(
std::string_view key, DBM::RecordProcessor* proc, bool writable);
Status ProcessMulti(
const std::vector<std::pair<std::string_view, DBM::RecordProcessor*>>& key_proc_pairs,
bool writable);
Status ProcessEach(DBM::RecordProcessor* proc, bool writable);
Status Count(int64_t* count);
Status GetFileSize(int64_t* size);
Status GetFilePath(std::string* path);
Status Clear();
Status Rebuild(const TreeDBM::TuningParameters& tuning_params);
Status ShouldBeRebuilt(bool* tobe);
Status Synchronize(bool hard, DBM::FileProcessor* proc);
std::vector<std::pair<std::string, std::string>> Inspect();
bool IsOpen();
bool IsWritable();
bool IsHealthy();
bool IsAutoRestored();
std::unique_ptr<DBM> MakeDBM();
const File* GetInternalFile();
int64_t GetEffectiveDataSize();
double GetModificationTime();
int32_t GetDatabaseType();
Status SetDatabaseType(uint32_t db_type);
std::string GetOpaqueMetadata();
Status SetOpaqueMetadata(const std::string& opaque);
KeyComparator GetKeyComparator();
Status ValidateRecords(int64_t record_base, int64_t end_offset);
private:
Status SaveMetadata();
Status LoadMetadata();
void InitializePageCache();
Status LoadLeafNode(int64_t id, bool promotion, std::shared_ptr<TreeLeafNode>* node);
Status SaveLeafNode(TreeLeafNode* node);
Status RemoveLeafNode(TreeLeafNode* node);
Status FlushLeafCache(bool empty);
void DiscardLeafCache();
Status LoadInnerNode(int64_t id, bool promotion, std::shared_ptr<TreeInnerNode>* node);
Status SaveInnerNode(TreeInnerNode* node);
Status RemoveInnerNode(TreeInnerNode* node);
Status FlushInnerCache(bool empty);
void DiscardInnerCache();
Status SearchTree(std::string_view key, std::shared_ptr<TreeLeafNode>* leaf_node);
Status TraceTree(std::string_view key, int64_t leaf_node_id, int64_t* hist, int32_t* hist_size);
Status ReorganizeTree();
bool CheckLeafNodeToDivide(TreeLeafNode* node);
bool CheckLeafNodeToMerge(TreeLeafNode* node);
Status DivideNodes(TreeLeafNode* leaf_node, const std::string& node_key);
Status MergeNodes(TreeLeafNode* leaf_node, const std::string& node_key);
void AddLinkToInnerNode(TreeInnerNode* node, int64_t child_id, std::string_view key);
void JoinPrevLinkInInnerNode(TreeInnerNode* node, int64_t child_id);
void JoinNextLinkInInnerNode(TreeInnerNode* node, int64_t child_id, int64_t next_id);
void ProcessImpl(
TreeLeafNode* node, std::string_view key, DBM::RecordProcessor* proc, bool writable);
Status AdjustCaches();
bool open_;
bool writable_;
bool healthy_;
bool auto_restored_;
std::string path_;
std::atomic_int64_t num_records_;
std::atomic_int64_t eff_data_size_;
int64_t root_id_;
int64_t first_id_;
int64_t last_id_;
int64_t num_leaf_nodes_;
int64_t num_inner_nodes_;
int32_t tree_level_;
int32_t max_page_size_;
int32_t max_branches_;
int32_t max_cached_pages_;
LeafSlot leaf_slots_[NUM_PAGE_SLOTS];
InnerSlot inner_slots_[NUM_PAGE_SLOTS];
KeyComparator key_comparator_;
TreeRecordComparator record_comp_;
TreeLinkComparator link_comp_;
std::string mini_opaque_;
AtomicSet<std::pair<int64_t, std::string>> reorg_ids_;
IteratorList iterators_;
std::unique_ptr<HashDBM> hash_dbm_;
std::atomic_uint32_t proc_clock_;
SpinSharedMutex mutex_;
};
class TreeDBMIteratorImpl final {
friend class TreeDBMImpl;
public:
explicit TreeDBMIteratorImpl(TreeDBMImpl* dbm);
~TreeDBMIteratorImpl();
Status First();
Status Last();
Status Jump(std::string_view key);
Status JumpLower(std::string_view key, bool inclusive);
Status JumpUpper(std::string_view key, bool inclusive);
Status Next();
Status Previous();
Status Process(DBM::RecordProcessor* proc, bool writable);
private:
void ClearPosition();
Status SetPositionFirst(int64_t leaf_id);
Status SetPositionLast(int64_t leaf_id);
void SetPositionWithKey(int64_t leaf_id, std::string_view key);
Status NextImpl(std::string_view key);
Status PreviousImpl(std::string_view key);
Status SyncPosition(std::string_view key);
Status ProcessImpl(std::string_view key, DBM::RecordProcessor* proc, bool writable);
TreeDBMImpl* dbm_;
char stack_[ITER_BUFFER_SIZE];
char* key_ptr_;
int32_t key_size_;
int64_t leaf_id_;
};
TreeLeafNode::TreeLeafNode(TreeDBMImpl* impl, int64_t prev_id, int64_t next_id)
: impl(impl), id(0), prev_id(prev_id), next_id(next_id), records(),
page_size(PAGE_ID_WIDTH * 2), dirty(true), on_disk(false), mutex() {
id = impl->num_leaf_nodes_++ + LEAF_NODE_ID_BASE;
}
TreeLeafNode::TreeLeafNode(TreeDBMImpl* impl, int64_t id, int64_t prev_id, int64_t next_id,
std::vector<TreeRecord*>&& records, int32_t page_size)
: impl(impl), id(id), prev_id(prev_id), next_id(next_id),
records(records), page_size(page_size), dirty(false), on_disk(true), mutex() {
}
TreeLeafNode::~TreeLeafNode() {
impl->SaveLeafNode(this);
FreeTreeRecords(&records);
}
std::shared_ptr<TreeLeafNode> TreeLeafNode::AddToCache() {
int32_t slot_index = id % NUM_PAGE_SLOTS;
LeafSlot* slot = impl->leaf_slots_ + slot_index;
std::lock_guard<SpinMutex> lock(slot->mutex);
return slot->cache->Add(id, this);
}
TreeInnerNode::TreeInnerNode(TreeDBMImpl* impl, int64_t heir_id)
: impl(impl), id(0), heir_id(heir_id), links(), dirty(true), on_disk(false) {
id = impl->num_inner_nodes_++ + INNER_NODE_ID_BASE;
}
TreeInnerNode::TreeInnerNode(TreeDBMImpl* impl, int64_t id, int64_t heir_id,
std::vector<TreeLink*>&& links)
: impl(impl), id(id), heir_id(heir_id), links(links), dirty(false), on_disk(true) {
}
TreeInnerNode::~TreeInnerNode() {
impl->SaveInnerNode(this);
FreeTreeLinks(&links);
}
std::shared_ptr<TreeInnerNode> TreeInnerNode::AddToCache() {
int32_t slot_index = id % NUM_PAGE_SLOTS;
InnerSlot* slot = impl->inner_slots_ + slot_index;
std::lock_guard<SpinMutex> lock(slot->mutex);
return slot->cache->Add(id, this);
}
Status DeserializeLeafNode(
std::string_view serialized,
int64_t* prev_id, int64_t* next_id, std::vector<TreeRecord*>* records) {
const char* rp = serialized.data();
int32_t record_size = serialized.size();
if (record_size < static_cast<int32_t>(PAGE_ID_WIDTH * 2)) {
return Status(Status::BROKEN_DATA_ERROR, "invalid leaf metadata");
}
*prev_id = ReadFixNum(rp, PAGE_ID_WIDTH);
rp += PAGE_ID_WIDTH;
record_size -= PAGE_ID_WIDTH;
*next_id = ReadFixNum(rp, PAGE_ID_WIDTH);
rp += PAGE_ID_WIDTH;
record_size -= PAGE_ID_WIDTH;
while (record_size > 0) {
uint64_t key_size = 0;
int32_t step = ReadVarNum(rp, record_size, &key_size);
if (step < 1) {
return Status(Status::BROKEN_DATA_ERROR, "invalid record key size");
}
rp += step;
record_size -= step;
if (record_size < static_cast<int32_t>(key_size)) {
return Status(Status::BROKEN_DATA_ERROR, "too short record key");
}
const std::string_view rec_key(rp, key_size);
rp += key_size;
record_size -= key_size;
uint64_t value_size = 0;
step = ReadVarNum(rp, record_size, &value_size);
if (step < 1) {
return Status(Status::BROKEN_DATA_ERROR, "invalid record value size");
}
rp += step;
record_size -= step;
if (record_size < static_cast<int32_t>(value_size)) {
return Status(Status::BROKEN_DATA_ERROR, "too short record value");
}
const std::string_view rec_value(rp, value_size);
rp += value_size;
record_size -= value_size;
records->emplace_back(CreateTreeRecord(rec_key, rec_value));
}
return Status(Status::SUCCESS);
}
Status DeserializeInnerNode(
std::string_view serialized, int64_t* heir_id, std::vector<TreeLink*>* links) {
const char* rp = serialized.data();
int32_t record_size = serialized.size();
if (record_size < static_cast<int32_t>(PAGE_ID_WIDTH)) {
return Status(Status::BROKEN_DATA_ERROR, "invalid inner metadata");
}
*heir_id = ReadFixNum(rp, PAGE_ID_WIDTH);
rp += PAGE_ID_WIDTH;
record_size -= PAGE_ID_WIDTH;
while (record_size > 0) {
uint64_t key_size = 0;
int32_t step = ReadVarNum(rp, record_size, &key_size);
if (step < 1) {
return Status(Status::BROKEN_DATA_ERROR, "invalid link key size");
}
rp += step;
record_size -= step;
if (record_size < static_cast<int32_t>(key_size)) {
return Status(Status::BROKEN_DATA_ERROR, "too short link key");
}
const std::string_view link_key(rp, key_size);
rp += key_size;
record_size -= key_size;
if (record_size < static_cast<int32_t>(PAGE_ID_WIDTH)) {
return Status(Status::BROKEN_DATA_ERROR, "too short link child ID");
}
const int64_t child_id = ReadFixNum(rp, PAGE_ID_WIDTH);
rp += PAGE_ID_WIDTH;
record_size -= PAGE_ID_WIDTH;
links->emplace_back(CreateTreeLink(link_key, child_id));
}
return Status(Status::SUCCESS);
}
TreeDBMImpl::TreeDBMImpl(std::unique_ptr<File> file)
: open_(false), writable_(false), healthy_(false), auto_restored_(false), path_(),
num_records_(0), eff_data_size_(0),
root_id_(0), first_id_(0), last_id_(0),
num_leaf_nodes_(0), num_inner_nodes_(0), tree_level_(0),
max_page_size_(TreeDBM::DEFAULT_MAX_PAGE_SIZE),
max_branches_(TreeDBM::DEFAULT_MAX_BRANCHES),
max_cached_pages_(TreeDBM::DEFAULT_MAX_CACHED_PAGES),
key_comparator_(nullptr), record_comp_(nullptr), link_comp_(nullptr),
mini_opaque_(), reorg_ids_(),
hash_dbm_(new HashDBM(std::move(file))), proc_clock_(0),
mutex_() {}
TreeDBMImpl::~TreeDBMImpl() {
if (open_) {
Close();
}
for (auto* iterator : iterators_) {
iterator->dbm_ = nullptr;
}
}
Status TreeDBMImpl::Open(const std::string& path, bool writable,
int32_t options, const TreeDBM::TuningParameters& tuning_params) {
std::lock_guard<SpinSharedMutex> lock(mutex_);
if (open_) {
return Status(Status::PRECONDITION_ERROR, "opened database");
}
const std::string norm_path = NormalizePath(path);
HashDBM::TuningParameters hash_params = tuning_params;
hash_params.offset_width = tuning_params.offset_width >= 0 ?
tuning_params.offset_width : TreeDBM::DEFAULT_OFFSET_WIDTH;
hash_params.align_pow = tuning_params.align_pow >= 0 ?
tuning_params.align_pow : TreeDBM::DEFAULT_ALIGN_POW;
hash_params.num_buckets = tuning_params.num_buckets >= 0 ?
tuning_params.num_buckets : TreeDBM::DEFAULT_NUM_BUCKETS;
hash_params.fbp_capacity = tuning_params.fbp_capacity >= 0 ?
tuning_params.fbp_capacity : TreeDBM::DEFAULT_FBP_CAPACITY;
hash_params.min_read_size = tuning_params.min_read_size;
if (hash_params.min_read_size < 1) {
hash_params.min_read_size = 1;
auto* pos_file = dynamic_cast<const PositionalFile*>(hash_dbm_->GetInternalFile());
if (pos_file != nullptr && pos_file->IsDirectIO()) {
hash_params.min_read_size = AlignNumber(max_page_size_, 1 << hash_params.align_pow);
}
}
if (tuning_params.max_page_size > 0) {
max_page_size_ = tuning_params.max_page_size;
}
if (tuning_params.max_branches > 1) {
max_branches_ = tuning_params.max_branches;
}
if (tuning_params.max_cached_pages > 0) {
max_cached_pages_ = tuning_params.max_cached_pages;
}
if (tuning_params.key_comparator != nullptr) {
key_comparator_ = tuning_params.key_comparator;
}
Status status = hash_dbm_->OpenAdvanced(norm_path, writable, options, hash_params);
if (status != Status::SUCCESS) {
return status;
}
auto_restored_ = false;
if (writable && hash_dbm_->IsAutoRestored() &&
tuning_params.restore_mode != HashDBM::RESTORE_READ_ONLY &&
tuning_params.restore_mode != HashDBM::RESTORE_NOOP) {
hash_dbm_->Close();
const std::string tmp_path = norm_path + ".tmp.restore";
const int64_t end_offset =
tuning_params.restore_mode == HashDBM::RESTORE_SYNC ? INT64MAX : INT64MIN;
RemoveFile(tmp_path);
status = TreeDBM::RestoreDatabase(norm_path, tmp_path, end_offset);
if (status != Status::SUCCESS) {
RemoveFile(tmp_path);
return status;
}
status = RenameFile(tmp_path, norm_path);
if (status != Status::SUCCESS) {
RemoveFile(tmp_path);
return status;
}
status = hash_dbm_->OpenAdvanced(norm_path, true, options, hash_params);
if (status != Status::SUCCESS) {
return status;
}
auto_restored_ = true;
}
if (writable && hash_dbm_->CountSimple() == 0 &&
hash_dbm_->GetOpaqueMetadata() == std::string(HashDBM::OPAQUE_METADATA_SIZE, 0)) {
num_records_.store(0);
eff_data_size_.store(0);
root_id_ = 0;
first_id_ = 0;
last_id_ = 0;
num_leaf_nodes_ = 0;
num_inner_nodes_ = 0;
InitializePageCache();
auto leaf_node = (new TreeLeafNode(this, 0, 0))->AddToCache();
root_id_ = leaf_node->id;
first_id_ = leaf_node->id;
last_id_ = leaf_node->id;
tree_level_ = 1;
status = FlushLeafCache(false);
if (status != Status::SUCCESS) {
hash_dbm_->Close();
return status;
}
status = SaveMetadata();
if (status != Status::SUCCESS) {
hash_dbm_->Close();
return status;
}
status = hash_dbm_->Synchronize(false);
if (status != Status::SUCCESS) {
hash_dbm_->Close();
return status;
}
status = LoadMetadata();
if (status != Status::SUCCESS) {
hash_dbm_->Close();
return status;
}
} else {
InitializePageCache();
status = LoadMetadata();
if (status != Status::SUCCESS) {
hash_dbm_->Close();
return status;
}
}
open_ = true;
writable_ = writable;
healthy_ = hash_dbm_->IsHealthy();
path_ = norm_path;
return Status(Status::SUCCESS);
}
Status TreeDBMImpl::Close() {
std::lock_guard<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
for (auto* iterator : iterators_) {
iterator->ClearPosition();
}
Status status(Status::SUCCESS);
if (!reorg_ids_.IsEmpty()) {
status |= ReorganizeTree();
}
status |= FlushLeafCache(true);
status |= FlushInnerCache(true);
if (writable_) {
status |= SaveMetadata();
}
status |= hash_dbm_->Close();
open_ = false;
writable_ = false;
healthy_ = false;
auto_restored_ = false;
path_.clear();
num_records_.store(0);
eff_data_size_.store(0);
root_id_ = 0;
first_id_ = 0;
last_id_ = 0;
num_leaf_nodes_ = 0;
num_inner_nodes_ = 0;
tree_level_ = 0;
max_page_size_ = TreeDBM::DEFAULT_MAX_PAGE_SIZE;
max_branches_ = TreeDBM::DEFAULT_MAX_BRANCHES;
max_cached_pages_ = TreeDBM::DEFAULT_MAX_CACHED_PAGES;
record_comp_ = TreeRecordComparator(LexicalKeyComparator);
link_comp_ = TreeLinkComparator(LexicalKeyComparator);
mini_opaque_.clear();
reorg_ids_.Clear();
proc_clock_.store(0);
return status;
}
Status TreeDBMImpl::Process(
std::string_view key, DBM::RecordProcessor* proc, bool writable) {
if (writable && !reorg_ids_.IsEmpty()) {
std::lock_guard<SpinSharedMutex> lock(mutex_);
const Status status = ReorganizeTree();
if (status != Status::SUCCESS) {
return status;
}
}
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
if (writable) {
if (!writable_) {
return Status(Status::PRECONDITION_ERROR, "not writable database");
}
if (!healthy_) {
return Status(Status::PRECONDITION_ERROR, "not healthy database");
}
}
std::shared_ptr<TreeLeafNode> leaf_node;
const Status status = SearchTree(key, &leaf_node);
if (status != Status::SUCCESS) {
return status;
}
if (writable) {
std::lock_guard<SpinSharedMutex> leaf_lock(leaf_node->mutex);
ProcessImpl(leaf_node.get(), key, proc, true);
} else {
std::shared_lock<SpinSharedMutex> leaf_lock(leaf_node->mutex);
ProcessImpl(leaf_node.get(), key, proc, false);
}
return AdjustCaches();
}
Status TreeDBMImpl::ProcessMulti(
const std::vector<std::pair<std::string_view, DBM::RecordProcessor*>>& key_proc_pairs,
bool writable) {
if (writable && !reorg_ids_.IsEmpty()) {
std::lock_guard<SpinSharedMutex> lock(mutex_);
const Status status = ReorganizeTree();
if (status != Status::SUCCESS) {
return status;
}
}
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
if (writable) {
if (!writable_) {
return Status(Status::PRECONDITION_ERROR, "not writable database");
}
if (!healthy_) {
return Status(Status::PRECONDITION_ERROR, "not healthy database");
}
}
std::vector<std::shared_ptr<TreeLeafNode>> leaf_nodes;
std::map<int64_t, std::shared_ptr<TreeLeafNode>> id_leaf_nodes;
for (const auto& key_proc : key_proc_pairs) {
std::shared_ptr<TreeLeafNode> leaf_node;
const Status status = SearchTree(key_proc.first, &leaf_node);
if (status != Status::SUCCESS) {
return status;
}
leaf_nodes.emplace_back(leaf_node);
id_leaf_nodes.emplace(std::make_pair(leaf_node->id, leaf_node));
}
for (const auto& id_leaf_node : id_leaf_nodes) {
if (writable) {
id_leaf_node.second->mutex.lock();
} else {
id_leaf_node.second->mutex.lock_shared();
}
}
for (size_t i = 0; i < key_proc_pairs.size(); i++) {
auto& key_proc = key_proc_pairs[i];
auto& leaf_node = leaf_nodes[i];
ProcessImpl(leaf_node.get(), key_proc.first, key_proc.second, writable);
}
for (auto id_leaf_node = id_leaf_nodes.rbegin();
id_leaf_node != id_leaf_nodes.rend(); id_leaf_node++) {
if (writable) {
id_leaf_node->second->mutex.unlock();
} else {
id_leaf_node->second->mutex.unlock_shared();
}
}
return AdjustCaches();
}
Status TreeDBMImpl::ProcessEach(DBM::RecordProcessor* proc, bool writable) {
if (writable && !reorg_ids_.IsEmpty()) {
std::lock_guard<SpinSharedMutex> lock(mutex_);
const Status status = ReorganizeTree();
if (status != Status::SUCCESS) {
return status;
}
}
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
if (writable) {
if (!writable_) {
return Status(Status::PRECONDITION_ERROR, "not writable database");
}
if (!healthy_) {
return Status(Status::PRECONDITION_ERROR, "not healthy database");
}
}
proc->ProcessEmpty(DBM::RecordProcessor::NOOP);
int64_t leaf_id = first_id_;
while (leaf_id > 0) {
std::shared_ptr<TreeLeafNode> node;
Status status = LoadLeafNode(leaf_id, false, &node);
if (status != Status::SUCCESS) {
return status;
}
if (writable) {
std::lock_guard<SpinSharedMutex> leaf_lock(node->mutex);
std::vector<std::string> keys;
keys.reserve(node->records.size());
for (const auto* rec : node->records) {
keys.emplace_back(std::string(rec->GetKey()));
}
for (const auto& key : keys) {
ProcessImpl(node.get(), key, proc, true);
}
} else {
std::shared_lock<SpinSharedMutex> leaf_lock(node->mutex);
for (const auto* rec : node->records) {
proc->ProcessFull(rec->GetKey(), rec->GetValue());
}
}
leaf_id = node->next_id;
status = AdjustCaches();
if (status != Status::SUCCESS) {
return status;
}
}
proc->ProcessEmpty(DBM::RecordProcessor::NOOP);
return Status(Status::SUCCESS);
}
Status TreeDBMImpl::Count(int64_t* count) {
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
*count = num_records_.load();
return Status(Status::SUCCESS);
}
Status TreeDBMImpl::GetFileSize(int64_t* size) {
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
return hash_dbm_->GetFileSize(size);
}
Status TreeDBMImpl::GetFilePath(std::string* path) {
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
*path = path_;
return Status(Status::SUCCESS);
}
Status TreeDBMImpl::Clear() {
std::lock_guard<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
if (!writable_) {
return Status(Status::PRECONDITION_ERROR, "not writable database");
}
for (auto* iterator : iterators_) {
iterator->ClearPosition();
}
reorg_ids_.Clear();
DiscardLeafCache();
DiscardInnerCache();
Status status = hash_dbm_->Clear();
num_records_.store(0);
eff_data_size_.store(0);
root_id_ = 0;
first_id_ = 0;
last_id_ = 0;
num_leaf_nodes_ = 0;
num_inner_nodes_ = 0;
InitializePageCache();
auto leaf_node = (new TreeLeafNode(this, 0, 0))->AddToCache();
root_id_ = leaf_node->id;
first_id_ = leaf_node->id;
last_id_ = leaf_node->id;
tree_level_ = 1;
status |= SaveMetadata();
return status;
}
Status TreeDBMImpl::Rebuild(const TreeDBM::TuningParameters& tuning_params) {
if (!reorg_ids_.IsEmpty()) {
std::lock_guard<SpinSharedMutex> lock(mutex_);
const Status status = ReorganizeTree();
if (status != Status::SUCCESS) {
return status;
}
}
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
if (!writable_) {
return Status(Status::PRECONDITION_ERROR, "not writable database");
}
if (!healthy_) {
return Status(Status::PRECONDITION_ERROR, "not healthy database");
}
Status status(Status::SUCCESS);
status |= FlushLeafCache(false);
status |= FlushInnerCache(false);
status |= SaveMetadata();
const HashDBM::TuningParameters hash_params = tuning_params;
if (tuning_params.max_page_size > 0) {
max_page_size_ = tuning_params.max_page_size;
}
if (tuning_params.max_branches > 1) {
max_branches_ = tuning_params.max_branches;
}
if (tuning_params.max_cached_pages > 0) {
max_cached_pages_ = tuning_params.max_cached_pages;
}
status |= hash_dbm_->RebuildAdvanced(hash_params);
return status;
}
Status TreeDBMImpl::ShouldBeRebuilt(bool* tobe) {
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
return hash_dbm_->ShouldBeRebuilt(tobe);
}
Status TreeDBMImpl::Synchronize(bool hard, DBM::FileProcessor* proc) {
std::lock_guard<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
if (!writable_) {
return Status(Status::PRECONDITION_ERROR, "not writable database");
}
if (!healthy_) {
return Status(Status::PRECONDITION_ERROR, "not healthy database");
}
Status status(Status::SUCCESS);
if (!reorg_ids_.IsEmpty()) {
status |= ReorganizeTree();
}
status |= FlushLeafCache(false);
status |= FlushInnerCache(false);
status |= SaveMetadata();
status |= hash_dbm_->Synchronize(hard, proc);
return status;
}
std::vector<std::pair<std::string, std::string>> TreeDBMImpl::Inspect() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
std::vector<std::pair<std::string, std::string>> meta;
auto Add = [&](const std::string& name, const std::string& value) {
meta.emplace_back(std::make_pair(name, value));
};
Add("class", "TreeDBM");
if (open_) {
Add("healthy", ToString(healthy_));
Add("auto_restored", ToString(auto_restored_));
Add("path", path_);
Add("num_records", ToString(num_records_.load()));
Add("eff_data_size", ToString(eff_data_size_.load()));
Add("root_id", ToString(root_id_));
Add("first_id", ToString(first_id_));
Add("last_id", ToString(last_id_));
Add("num_leaf_nodes", ToString(num_leaf_nodes_));
Add("num_inner_nodes", ToString(num_inner_nodes_));
Add("tree_level", ToString(tree_level_));
Add("max_page_size", ToString(max_page_size_));
Add("max_branches", ToString(max_branches_));
Add("max_cached_pages", ToString(max_cached_pages_));
std::string comp_name;
if (key_comparator_ == LexicalKeyComparator) {
comp_name = "LexicalKeyComparator";
} else if (key_comparator_ == LexicalCaseKeyComparator) {
comp_name = "LexicalCaseKeyComparator";
} else if (key_comparator_ == DecimalKeyComparator) {
comp_name = "DecimalKeyComparator";
} else if (key_comparator_ == HexadecimalKeyComparator) {
comp_name = "HexadecimalKeyComparator";
} else if (key_comparator_ == RealNumberKeyComparator) {
comp_name = "RealNumberKeyComparator";
} else if (key_comparator_ == PairLexicalKeyComparator) {
comp_name = "PairLexicalKeyComparator";
} else if (key_comparator_ == PairLexicalCaseKeyComparator) {
comp_name = "PairLexicalCaseKeyComparator";
} else if (key_comparator_ == PairDecimalKeyComparator) {
comp_name = "PairDecimalKeyComparator";
} else if (key_comparator_ == PairHexadecimalKeyComparator) {
comp_name = "PairHexadecimalKeyComparator";
} else if (key_comparator_ == PairRealNumberKeyComparator) {
comp_name = "PairRealNumberKeyComparator";
} else {
comp_name = "custom";
}
Add("key_comparator", ToString(comp_name));
const std::map<std::string, std::string> name_map = {
{"class", ""}, {"path", ""},
{"num_buckets", "hash_num_buckets"},
{"num_records", "hash_num_records"},
{"eff_data_size", "hash_eff_data_size"},
};
for (const auto& rec : hash_dbm_->Inspect()) {
std::string name = rec.first;
const auto it = name_map.find(name);
if (it != name_map.end()) {
name = it->second;
}
if (!name.empty()) {
Add(name, rec.second);
}
}
}
return meta;
}
bool TreeDBMImpl::IsOpen() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
return open_;
}
bool TreeDBMImpl::IsWritable() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
return open_ && writable_;
}
bool TreeDBMImpl::IsHealthy() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
return open_ && healthy_;
}
bool TreeDBMImpl::IsAutoRestored() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
return open_ && auto_restored_;
}
std::unique_ptr<DBM> TreeDBMImpl::MakeDBM() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
return std::make_unique<TreeDBM>(hash_dbm_->GetInternalFile()->MakeFile());
}
const File* TreeDBMImpl::GetInternalFile() {
return hash_dbm_->GetInternalFile();
}
int64_t TreeDBMImpl::GetEffectiveDataSize() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return -1;
}
return eff_data_size_.load();
}
double TreeDBMImpl::GetModificationTime() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return -1;
}
return hash_dbm_->GetModificationTime();
}
int32_t TreeDBMImpl::GetDatabaseType() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return -1;
}
return hash_dbm_->GetDatabaseType();
}
Status TreeDBMImpl::SetDatabaseType(uint32_t db_type) {
std::lock_guard<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
if (!writable_) {
return Status(Status::PRECONDITION_ERROR, "not writable database");
}
return hash_dbm_->SetDatabaseType(db_type);
}
std::string TreeDBMImpl::GetOpaqueMetadata() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return "";
}
return mini_opaque_;
}
Status TreeDBMImpl::SetOpaqueMetadata(const std::string& opaque) {
std::lock_guard<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
if (!writable_) {
return Status(Status::PRECONDITION_ERROR, "not writable database");
}
mini_opaque_ = opaque;
return Status(Status::SUCCESS);
}
KeyComparator TreeDBMImpl::GetKeyComparator() {
std::shared_lock<SpinSharedMutex> lock(mutex_);
if (!open_) {
return nullptr;
}
return key_comparator_;
}
Status TreeDBMImpl::ValidateRecords(int64_t record_base, int64_t end_offset) {
std::lock_guard<SpinSharedMutex> lock(mutex_);
if (!open_) {
return Status(Status::PRECONDITION_ERROR, "not opened database");
}
return hash_dbm_->ValidateRecords(record_base, end_offset);
}
Status TreeDBMImpl::SaveMetadata() {
std::string opaque(HashDBM::OPAQUE_METADATA_SIZE, 0);
char* wp = const_cast<char*>(opaque.data());
std::memcpy(wp, META_MAGIC_DATA, sizeof(META_MAGIC_DATA));
WriteFixNum(wp + META_OFFSET_NUM_RECORDS, num_records_.load(), 6);
WriteFixNum(wp + META_OFFSET_EFF_DATA_SIZE, eff_data_size_.load(), 6);
WriteFixNum(wp + META_OFFSET_ROOT_ID, root_id_, 6);
WriteFixNum(wp + META_OFFSET_FIRST_ID, first_id_, 6);
WriteFixNum(wp + META_OFFSET_LAST_ID, last_id_, 6);
WriteFixNum(wp + META_OFFSET_NUM_LEAF_NODES, num_leaf_nodes_, 6);
WriteFixNum(wp + META_OFFSET_NUM_INNER_NODES, num_inner_nodes_, 6);
WriteFixNum(wp + META_OFFSET_MAX_PAGE_SIZE, max_page_size_, 3);
WriteFixNum(wp + META_OFFSET_MAX_BRANCHES, max_branches_, 3);
WriteFixNum(wp + META_OFFSET_TREE_LEVEL, tree_level_, 1);
uint32_t key_comp_type = 0;
if (key_comparator_ == nullptr || key_comparator_ == LexicalKeyComparator) {
key_comp_type = 1;
} else if (key_comparator_ == LexicalCaseKeyComparator) {
key_comp_type = 2;
} else if (key_comparator_ == DecimalKeyComparator) {
key_comp_type = 3;
} else if (key_comparator_ == HexadecimalKeyComparator) {
key_comp_type = 4;
} else if (key_comparator_ == RealNumberKeyComparator) {
key_comp_type = 5;
} else if (key_comparator_ == PairLexicalKeyComparator) {
key_comp_type = 101;
} else if (key_comparator_ == PairLexicalCaseKeyComparator) {